Proxy and it's steps
In computer networks, a proxy server is really a server that acts being an intermediary for requests from consumers seeking sources from different hosts. A client connects to the proxy server, requesting some assistance, suchs a file, relationship, website, or other resource available from a different server and the request is evaluated by proxy server as a means to simplify and manage its difficulty. Proxies were invented to add construction and encapsulation to distributed programs. Today, most proxies are web proxies, facilitating usage of material on the Entire World Wide Web.
Step 1: Implement a barebones proxy
Opens a TCP server socket to listen for TCP connections on a particular port. When a new link is setup, the proxy flows in a HTTP request; yourcode must be compatible with HTTP GET requests sent by the curl HTTP client. The low-cost proxy should then go on that HTTP request for the pertinent webserver, obtain the info received, and deliver it back once again to the client on the TCP connection that the client had founded. You must ensure that you are designed for interleaving of requests from multiple clients by keeping suďŹƒcient state so that you return an answer obtained from a webserver back to the proper client.
In place of regularly ballot sockets to get information by buy proxies, you need to implement network I/O signal using the select call. Furthermore, ensure that you handle all problems thus that your implementation is effective.
Step 2: Make the proxy multithreaded
To enhance the throughput o ered, make your compensated proxy services multi-threaded. The proxy would work in exactly the same way as above, except that when information will be Obtained, a brand new thread is created to do so. However, you need to restrict the number of strings in your code to at most 20, instead of let the number of Posts grow unbounded.
Step 3: Add a cache to the proxy
To help expand boost throughput, put in a cache to your inexpensive SEO proxies. At any given moment, the cache should include at most of the 10 MB of data. To evict data in the cache when there is a cache miss, implement the Smallest Amount Of-Recently-Used (LRU) cache Substitute plan, i.e., always put to the cache probably the most recently seen Thing and to incorporate it into the cache, evict the appropriate number of least recently used items in the cache. Make certain that writes and reads from For your cache are thread-safe.
Step 4: Deploy the proxy on EC2
Requirements and Deliverables
Your entire code should be written in C. System I/O must use the select, recv, and send calls. The next two deliverables are required at the conclusion of the task, each due before class on 31st January 2011. • Release your Cheap proxy on EC2 and email me the address where your proxy is available. The address estimated is of the format hostname:port or IPAddress:port. I will then assess your implementation with my test suite, which will bring webpages via your proxy. • Email me an archive which has all your source-code.
Grading policy
This project may be worth 20 points. 10 things: I will go over your source-code to make sure your implementation of (a) select-based plug programming, (b) thread pool, and (d) thread-safe cache search accurate. 10 points: I will bring web-pages via your very best paid proxy support utilizing the curl HTTP client. Your proxy must be powerful enough to handle web requests to arbitrary web sites. The submission that brings the maximum throughput will be awarded 10 things. How many points awarded to all others will soon be equal in porportion to the portion with this maximum throughput their proxy offers.
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